Question

Resolva as expressões abaixo

A)2a+3a-4a=

B) x²+2x+3x²-x=

c) 3ab+2a-5b-3a+4b-2ab=

D)5y-3z+2y-4z=

e)1,3x+2,1y+0,8x+3,4y=

f)x²y²+2x³y-4xy²+3x²y²-xy²=

g)2a.3a=

h)x.3x³=

i) c.c.c.c.c.c=

j)4m.3n=

k)2y.2y.2y=

l) 3z².3z²=​

Answer 1

Há infinitas formas de reescrever essas expressões.

a)

$a(2 + 3 - 4) = a(1) = a$

b)

$x(x + 2 + 3x - 1) = {x}^{2} (1 + \frac{2}{x} + 3 - \frac{1}{x} ) = ...$

c)

$3ab + 2 a - 5b - 3a + 4b - 2ab \\ \\ 3ab - 2ab - 3a + 2a - 5b + 4b \\ \\ ab - a - b$

d)

$5y - 3z + 2y - 4z \\ \\ 5y + 2y - 4z - 3z \\ \\ 7y - 7z \\ \\ 7(y - z)$

e)

$(1.3 + 0.8)(x) + (2.1 + 3.4)(y) \\ \\ 2.1x + 5.5y$

f)

$(1 + 3) {x}^{2} {y}^{2} + ( - 4 - 1)x {y}^{2} + 2x {}^{3} y \\ \\ 4 {x}^{2} {y}^{2} - 5x {y}^{2} + 2 {x}^{3}y \\ \\ xy(4xy - 5y + 2{x}^{2} )$

g)

$2a \times 3a = (2 \times 3)(a \times a) = 6 {a}^{2}$

h)

$x \times 3x {}^{3} = (1 \times 3)(x \times {x}^{3} ) = 3 {x}^{4}$

i)

$c \times c \times c \times c \times c \times c = c {}^{1 + 1 + 1 + 1 + 1 + 1} = \\ \\ = c {}^{6}$

j)

$4m \times 3n = (4 \times 3) \times (m \times n) = 12mn$

k)

$2y \times 2y \times 2y = (2y) {}^{ 3} = 8y {}^{3}$

l)

$3 {z}^{2} \times 3 {z}^{2} = (3 {z}^{2} ) {}^{2} = 9z {}^{4}$